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<pre><code class="lang-java"><span class="hljs-keyword">public</span> <span class="hljs-keyword">abstract</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">AbstractLogger</span> </span>{
   <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">int</span> INFO = <span class="hljs-number">1</span>;
   <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">int</span> DEBUG = <span class="hljs-number">2</span>;
   <span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">int</span> ERROR = <span class="hljs-number">3</span>;

   <span class="hljs-keyword">protected</span> <span class="hljs-keyword">int</span> level;

   <span class="hljs-comment">//&#x8D23;&#x4EFB;&#x94FE;&#x4E2D;&#x7684;&#x4E0B;&#x4E00;&#x4E2A;&#x5143;&#x7D20;</span>
   <span class="hljs-keyword">protected</span> AbstractLogger nextLogger;

   <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">setNextLogger</span><span class="hljs-params">(AbstractLogger nextLogger)</span></span>{
      <span class="hljs-keyword">this</span>.nextLogger = nextLogger;
   }

   <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">logMessage</span><span class="hljs-params">(<span class="hljs-keyword">int</span> level, String message)</span></span>{
      <span class="hljs-keyword">if</span>(<span class="hljs-keyword">this</span>.level &lt;= level){
         write(message);
      }
      <span class="hljs-keyword">if</span>(nextLogger !=<span class="hljs-keyword">null</span>){
         nextLogger.logMessage(level, message);
      }
   }

   <span class="hljs-function"><span class="hljs-keyword">abstract</span> <span class="hljs-keyword">protected</span> <span class="hljs-keyword">void</span> <span class="hljs-title">write</span><span class="hljs-params">(String message)</span></span>;

}
</code></pre>
<p><strong>&#x5B9A;&#x4E49;&#x8282;&#x70B9;</strong></p>
<pre><code class="lang-java"><span class="hljs-comment">//&#x63A7;&#x5236;&#x53F0;&#x65E5;&#x5FD7;</span>
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">ConsoleLogger</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">AbstractLogger</span> </span>{

   <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">ConsoleLogger</span><span class="hljs-params">(<span class="hljs-keyword">int</span> level)</span></span>{
      <span class="hljs-keyword">this</span>.level = level;
   }

   <span class="hljs-meta">@Override</span>
   <span class="hljs-function"><span class="hljs-keyword">protected</span> <span class="hljs-keyword">void</span> <span class="hljs-title">write</span><span class="hljs-params">(String message)</span> </span>{    
      System.out.println(<span class="hljs-string">&quot;Standard Console::Logger: &quot;</span> + message);
   }
}

<span class="hljs-comment">//&#x5F02;&#x5E38;&#x65E5;&#x5FD7;</span>
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">ErrorLogger</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">AbstractLogger</span> </span>{

   <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">ErrorLogger</span><span class="hljs-params">(<span class="hljs-keyword">int</span> level)</span></span>{
      <span class="hljs-keyword">this</span>.level = level;
   }

   <span class="hljs-meta">@Override</span>
   <span class="hljs-function"><span class="hljs-keyword">protected</span> <span class="hljs-keyword">void</span> <span class="hljs-title">write</span><span class="hljs-params">(String message)</span> </span>{    
      System.out.println(<span class="hljs-string">&quot;Error Console::Logger: &quot;</span> + message);
   }
}

<span class="hljs-comment">//&#x6587;&#x672C;&#x65E5;&#x5FD7;</span>
<span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">FileLogger</span> <span class="hljs-keyword">extends</span> <span class="hljs-title">AbstractLogger</span> </span>{

   <span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">FileLogger</span><span class="hljs-params">(<span class="hljs-keyword">int</span> level)</span></span>{
      <span class="hljs-keyword">this</span>.level = level;
   }

   <span class="hljs-meta">@Override</span>
   <span class="hljs-function"><span class="hljs-keyword">protected</span> <span class="hljs-keyword">void</span> <span class="hljs-title">write</span><span class="hljs-params">(String message)</span> </span>{    
      System.out.println(<span class="hljs-string">&quot;File::Logger: &quot;</span> + message);
   }
}
</code></pre>
<p><strong>&#x8BBE;&#x7F6E;&#x94FE;&#x4E0A;&#x7684;&#x8282;&#x70B9;</strong></p>
<pre><code class="lang-java"><span class="hljs-keyword">public</span> <span class="hljs-class"><span class="hljs-keyword">class</span> <span class="hljs-title">ChainPatternDemo</span> </span>{

   <span class="hljs-function"><span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> AbstractLogger <span class="hljs-title">getChainOfLoggers</span><span class="hljs-params">()</span></span>{

      AbstractLogger errorLogger = <span class="hljs-keyword">new</span> ErrorLogger(AbstractLogger.ERROR);
      AbstractLogger fileLogger = <span class="hljs-keyword">new</span> FileLogger(AbstractLogger.DEBUG);
      AbstractLogger consoleLogger = <span class="hljs-keyword">new</span> ConsoleLogger(AbstractLogger.INFO);

      errorLogger.setNextLogger(fileLogger);
      fileLogger.setNextLogger(consoleLogger);

      <span class="hljs-keyword">return</span> errorLogger;  
   }

}
</code></pre>
<p><strong>&#x8C03;&#x7528;&#x94FE;:</strong></p>
<pre><code class="lang-java"><span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> <span class="hljs-keyword">void</span> <span class="hljs-title">main</span><span class="hljs-params">(String[] args)</span> </span>{
      AbstractLogger loggerChain = getChainOfLoggers();

      loggerChain.logMessage(AbstractLogger.INFO, <span class="hljs-string">&quot;This is an information.&quot;</span>);

      loggerChain.logMessage(AbstractLogger.DEBUG, 
         <span class="hljs-string">&quot;This is a debug level information.&quot;</span>);

      loggerChain.logMessage(AbstractLogger.ERROR, 
         <span class="hljs-string">&quot;This is an error information.&quot;</span>);
   }
</code></pre>
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